User Guide

190-00494-00 Rev. B
Garmin G1000 Pilot’s Guide for Cessna Citation Mustang
6-59
HAZARD AVOIDANCE
Table 6-8 shows system status annunciations that may also be issued:
Alert Type
Annunciations
on the PFD/
MFD, Naviga
-
tion Map,
TAWS Page
MFD
Pop-Up Alert
Aural Message
TAWS System Test Fail None “TAWS System Failure”
TAWS Alerting is disabled
None None
No GPS position or excessively degraded
GPS signal
None “TAWS Not Available”
“TAWS Available” is generated when sufficient
GPS signal is re-established.
System Test in progress None None
System Test pass None None “TAWS System Test OK”
Table 6-8 Additional System Annunciations
FORWARD LOOKING TERRAIN AVOIDANCE
The Forward Looking Terrain Avoidance (FLTA) alert is used by TAWS and is composed of:
• REDUCED REQUIRED TERRAIN CLEARANCE AND REDUCED REQUIRED OBSTACLE CLEARANCE
Reduced Required Terrain Clearance (RTC) and Reduced Required Obstacle Clearance (ROC) alerts are
issued when the aircraft flight path is above terrain, yet is projected to come within the minimum clearance
values in Table 6-9. When an RTC alert is issued, a potential impact point is displayed on the TAWS
Page.
• IMMINENT TERRAIN IMPACT AND IMMINENT OBSTACLE IMPACT
Imminent Terrain Impact (ITI) and Imminent Obstacle Impact (IOI) alerts are issued when the aircraft
is below the elevation of a terrain or obstacle cell in the aircraft’s projected path. ITI and IOI alerts are
accompanied by a potential impact point displayed on the TAWS Page. The alert is annunciated when the
projected vertical flight path is calculated to come within minimum clearance altitudes in Table 6-9.
Phase of Flight Minimum Clearance
Altitude Level Flight (ft)
Minimum Clearance
Altitude Descending (ft)
Enroute 700 500
Terminal
350 300
Approach 150 100
Departure 100 100
Table 6-9 Minimum Terrain and Obstacle Clearance Values for FLTA Alerts
During the final approach phase of flight, FLTA alerts are automatically inhibited when the aircraft is
below 200 feet AGL while within 0.5 nm of the approach runway or below 125 feet AGL while within 1.0
nm of the runway threshold.